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Square D QO2401021 - Molded Case Circuit Breaker 40A 2-Pole

Square D
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Square D QO2401021 is a QO Series 2-pole molded case circuit breaker designed for overcurrent protection in residential and light commercial electrical systems. It provides a 40A current rating at 120/240VAC with a 10kA interrupting capacity, utilizing a thermal magnetic trip mechanism for long-time and instantaneous protection. The breaker measures 3.1 in (79 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) and weighs 0.92 lb, featuring a plug-in connection with lug terminals that accept copper or aluminum wire from 8 AWG to 2 AWG. It is CSA certified and UL listed, complying with industry safety standards for reliable operation. This unit is intended for use in QO load centers and NQ panelboards, supporting single-phase applications with shunt trip functionality.

Key Features & Specifications
  • Type: QO
  • Family: QO Series
  • Item Subcategory: Molded Case
  • Breaker Type: Shunt Trip
  • Poles: 2
  • Phase: 1
  • Current Rating: 40A
  • Voltage Rating: 120/240V
  • AIC rating: 10kA@240V
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous Trip
  • Frame Size: 100A/QO
  • Connection: Plug-In
  • Terminal Connection: Lug
  • Wire Size: AWG 8 to AWG 2, Copper/Aluminum
  • MCM Size: Min. Wire Size 8 AWG Max. Wire Size 2 AWG
  • Panel Type: QO Load Centers and NQ Panelboards
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Standards: CSA Certified, UL Listed
  • Certification: UL Listed
  • Country of Origin: Mexico
  • Dimensions: 3.1 in (79 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Weight: 0.92 lb


Product Identification
  • UPC: 785901493983
  • GTIN: 00785901493983